Bug 1577867 - Remove using namespace std from image/ r=tnikkel

Differential Revision: https://phabricator.services.mozilla.com/D44250

--HG--
extra : moz-landing-system : lando

Author: EricRahm

image/imgLoader.cpp

@@ -7,6 +7,8 @@
 // Undefine windows version of LoadImage because our code uses that name.
 #undef LoadImage
 
+#include <algorithm>
+
 #include "ImageLogging.h"
 #include "imgLoader.h"
 
@@ -998,9 +1000,6 @@ void imgCacheQueue::UpdateSize(int32_t diff) { mSize += diff; }
 
 uint32_t imgCacheQueue::GetSize() const { return mSize; }
 
-#include <algorithm>
-using namespace std;
-
 void imgCacheQueue::Remove(imgCacheEntry* entry) {
   uint64_t index = mQueue.IndexOf(entry);
   if (index == queueContainer::NoIndex) {